Pneumatic Turbine Blade Control With Fail-Safe Emergency Stop

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Solution Overview

Problem

Existing automation and control systems for energy generation turbines with moving blades face challenges such as high maintenance costs, environmental risks due to hydraulic fluid leaks, and the lack of an integrated emergency stop system to prevent damage from water hammer or overspeed.

Innovation Solution

A pneumatic actuator-based automation and control system that uses a set of pneumatic valves and a PID controller to adjust the angular position of turbine blades, incorporating an emergency stop mechanism that locks the actuator in a predetermined position to prevent turbine rotation in case of failure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hydraulic actuators are used to control turbine blades, then the control function is achieved, but maintenance costs increase and environmental risks arise due to fluid leaks

Engineering Contradiction:

Improvecontrol reliabilityVSAvoidenvironmental harm from leaks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the hydraulic actuation system with a pneumatic actuation system. The pneumatic actuator uses compressed air to move the turbine blades, eliminating the need for hydraulic fluid. This substitution resolves the environmental harm issue while maintaining the control function through pneumatic pressure actuation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent specifically implements a pneumatic actuation system where compressed air is used to drive the turbine blade control mechanism. The pneumatic circuit includes pressure regulators, control valves, and actuators that replace the hydraulic system, providing the same control functionality without the environmental risks of hydraulic fluid leakage.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Reliability

If hydraulic actuators are used for blade control, then the control function is achieved, but maintenance complexity and costs increase

Engineering Contradiction:

Improvecontrol reliabilityVSAvoidmaintenance difficulty

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The patent replaces the complex hydraulic system with a simpler pneumatic system. Pneumatic actuators have fewer seals, no hydraulic fluid handling requirements, and simpler maintenance procedures. The compressed air system eliminates the need for fluid filtration, contamination control, and specialized hydraulic maintenance expertise.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If emergency stop system is not integrated, then device complexity is reduced, but operational safety decreases during failures

Engineering Contradiction:

Improvesystem complexityVSAvoidoperational safety

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent implements an emergency stop system that pre-positions the turbine blades to a safe closure angle before any failure occurs. The pneumatic actuator is designed with fail-safe springs or positioning mechanisms that automatically move the blades to the closed position upon loss of pneumatic pressure, preventing water hammer and overspeed conditions without requiring complex active control systems.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent incorporates sensors that monitor the actual blade position and provide feedback to the control system. This feedback mechanism ensures that the blades reach the desired emergency position and prevents unintended movements. The system includes position sensors, control algorithms, and monitoring mechanisms that enhance safety while maintaining manageable complexity.

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system reduces maintenance costs and environmental risks, enhances operational safety by preventing turbine rotation during failures, and optimizes energy generation performance by controlling blade positions effectively.

Implementation Method 1

adjust the angular position of the blades or needles that control the flow rate directed towards motors or hydraulic turbines using pneumatic or hydropneumatic actuators

Methodology Applied

Scientific EffectPneumatic pressure: Pressure Increase

Implementation Method 2

the pneumatic or hydropneumatic components lock the actuator in a pre-determined position, preventing the turbine from rotating

Methodology Applied

Scientific EffectMechanical locking: Mechanical Force

Data Source

PatentEP4506575A1Automation and control system applied to energy generation systems in hydroelectric plants

Publication Date: 2025.02.12 RIO PARANAPANEMA ENERGIA SA

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AI summary

"AUTOMATION AND CONTROL SYSTEM APPLIED TO ENERGY GENERATION SYSTEMS IN HYDROELECTRIC PLANTS", wherein said automation and control system comprises a set of pneumatic actuators (1), a source of compressed air, a set of pneumatic valves (3 and 4), at least one linear position transducer (5), a set of emergency valves (6 and 7) and a PID controller (C), responsible for controlling the position of said pneumatic actuators (1) during the operation of the hydroelectric plant and in case of emergency stops, based on the activation of the pneumatic valves (3 and 4) and emergency valves (6 and 7).